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Aims. Using temporal series image data from the Coronal Diagnostic Spectrometer (CDS) on SOHO, we study oscillations found in intensity (radiance) measurements from the transition region O 629 line with the aim of finding evidence of wave harmonics in cool loops. Methods. Using standard Fourier techniques, together with a pre-whitening method, we measure all statistically significant frequencies present in oscillations found in flaring active region loops at the temperature of O . Bydoi:10.1051/0004-6361:20078122 fatcat:3jjxzzw3onbvvnjt3b5gybrv4y